class_docstr: Unit tests for RenderedTaskInstanceFields.
code: def teardown_method(self):
      self.clean_db()
  
imports: from __future__ import annotations
  import os
  from collections import Counter
  from datetime import date, timedelta
  from unittest import mock
  import pytest
  from airflow import settings
  from airflow.models import Variable
  from airflow.models.renderedtifields import RenderedTaskInstanceFields
  from airflow.operators.bash import BashOperator
  from airflow.utils.task_instance_session import set_current_task_instance_session
  from airflow.utils.timezone import datetime
  from tests.test_utils.asserts import assert_queries_count
  from tests.test_utils.db import clear_db_dags, clear_db_runs, clear_rendered_ti_fields
label_desc: Use image node_id 3 for calling the TestRenderedTaskInstanceFields obj's underlying member method code with example usage: obj.teardown_method() without return types